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In that example, we're moving the home directory for 
jdoe
 to 
/home/jdoe
, and then 
in the second example, we're changing the username from 
jdoe
 to 
jsmith
.
If you wish to remove a user from a group, you can use the 
gpasswd
 command to do 
so. 
gpasswd -d
 will do the trick:
sudo gpasswd -d  
In fact, 
gpasswd
 can also be used in place of 
usermod
 to add a user to a group:
sudo gpasswd -a  
So, now you know how to manage groups. With the efficient management of groups, 
you'll be able to manage the resources on your server better. Of course, groups 
are relatively useless without some explanation of how to manage permissions 
(otherwise, nothing would actually be enforcing a member of a group to be allowed 
access to a resource). Later on in this chapter, we'll cover permissions so that you 
have a complete understanding of how to manage user access.